doc: fix a link in go1.11.html and flesh out a few sections
doc: fix a link in go1.11.html and flesh out a few sections

Change-Id: Ic5b9ccb2772534cee77ffcaeee617c7d5edfb6fd
Reviewed-on: https://go-review.googlesource.com/124715
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

cloudflare/go,cloudflare/go,akutz/go,josharian/go,cloudflare/go,nawawi/go,CAFxX/go,cloudflare/go,CAFxX/go,cloudflare/go,josharian/go,josharian/go,nawawi/go,akutz/go,golang/go,josharian/go,akutz/go,josharian/go,CAFxX/go,CAFxX/go,nawawi/go,josharian/go,josharian/go,golang/go,nawawi/go,CAFxX/go,nawawi/go,golang/go,akutz/go,josharian/go,CAFxX/go,cloudflare/go,cloudflare/go,CAFxX/go,golang/go,akutz/go,nawawi/go,akutz/go,golang/go,golang/go,golang/go,akutz/go,nawawi/go,nawawi/go,cloudflare/go,CAFxX/go,golang/go,akutz/go